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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb46dda768d806af862c6e3e65e73e240fa0a64e5ea2251d50d8ce46b196ab6f' 
  AND token = 'V7ftHJlAIMDVUNraM3hcXHqh3vLMnAVLNwKcCwky26c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}